def test_LU():
L, U = lu(X)
assert L.shape == U.shape == X.shape
assert ask(Q.lower_triangular(L))
assert ask(Q.upper_triangular(U))
def test_LU():
L, U = lu(X)
assert L.shape == U.shape == X.shape
assert ask(Q.lower_triangular(L))
assert ask(Q.upper_triangular(U))